Standardize usage of virtual/override/final specifiers.

chrome/browser/signin/signin_manager_unittest.cc

Index: chrome/browser/signin/signin_manager_unittest.cc
diff --git a/chrome/browser/signin/signin_manager_unittest.cc b/chrome/browser/signin/signin_manager_unittest.cc
index 1c439998a981d972ec1ca097cf1df467c13d461f..f1bee6fab797e66ff28fc47881fb0aedc82a11b4 100644
--- a/chrome/browser/signin/signin_manager_unittest.cc
+++ b/chrome/browser/signin/signin_manager_unittest.cc
@@ -91,9 +91,9 @@ class TestSigninManagerObserver : public SigninManagerBase::Observer {
 class SigninManagerTest : public testing::Test {
  public:
   SigninManagerTest() : manager_(NULL) {}
-  virtual ~SigninManagerTest() {}
+  ~SigninManagerTest() override {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     manager_ = NULL;
     prefs_.reset(new TestingPrefServiceSimple);
     chrome::RegisterLocalState(prefs_->registry());
@@ -113,7 +113,7 @@ class SigninManagerTest : public testing::Test {
             SetURLRequestContext(profile_->GetRequestContext());
   }
 
-  virtual void TearDown() override {
+  void TearDown() override {
     if (manager_)
       manager_->RemoveObserver(&test_observer_);